linux-kernel - Re: ATA 4 KiB sector issues.

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Message-ID: <4B9F24BE.3070401@wytron.com.tw>
Date:	Tue, 16 Mar 2010 14:27:10 +0800
From:	Thomas Chou <thomas@...ron.com.tw>
To:	James Bottomley <James.Bottomley@...e.de>
CC:	Tejun Heo <tj@...nel.org>,
	Denys Vlasenko <vda.linux@...glemail.com>,
	Arnd Bergmann <arnd@...db.de>,
	"linux-ide@...r.kernel.org" <linux-ide@...r.kernel.org>,
	lkml <linux-kernel@...r.kernel.org>,
	Daniel Taylor <Daniel.Taylor@....com>,
	Jeff Garzik <jeff@...zik.org>, Mark Lord <kernel@...savvy.com>,
	tytso@....edu, "H. Peter Anvin" <hpa@...or.com>,
	hirofumi@...l.parknet.co.jp,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>, irtiger@...il.com,
	Matthew Wilcox <matthew@....cx>, aschnell@...e.de,
	knikanth@...e.de, jdelvare@...e.de
Subject: Re: ATA 4 KiB sector issues.

On 03/16/2010 02:14 PM, James Bottomley wrote:
>
> The big problem is that 99% of the x86 systems out there still use the
> ancient msdos label for their boot disks, so aligning H/S going forwards
> will give us a nice "just works" for x86 boxes.
>
>    
The key issue is not "just work", but "performance". When unaligned, the 
write performance can be lower than 50% of the expected rate.

- Thomas
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